That's because it is the Caddy. (Bruno, I do wish you would include a short explanation with each of these.)

It's the upcoming ATS coupe, which is the closest thing to the 6thgen that we know of so far. However, while that might make it a reasonable one to PS due to rough overall dimensions, rest assured that it will look nothing like it (consider that the 5thgen Camaro is on a modified version of the Pontiac G8/Holden Commodore chassis).

Regardless of styling, these concepts are all well photoshopped. Keep it up!